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ELECTRICAL DATA S3C2440A RISC MICROPROCESSOR
27-36
Table 27-7 Clock Timing Constants
(V
DDi,
V
DDalive,
V
DDiarm
= 1.2 V ± 0.1 V, T
A
= -40 to 85 °C, V
DDMOP
= 3.3V ± 0.3V)
Parameter Symbol Min Typ Max Unit
Crystal clock input frequency
f
XTAL
12 – 20 MHz
Crystal clock input cycle time
t
XTALCYC
50 – 83.3 ns
External clock input frequency
f
EXT
– – 66 MHz
External clock input cycle time
t
EXTCYC
15.0 – – ns
External clock input low level pulse width
t
EXTLOW
7 – – ns
External clock to HCLK (without PLL)
t
EX2HC
3 – 7 ns
HCLK (internal) to CLKOUT
t
HC2CK
3 – 9 ns
HCLK (internal) to SCLK
t
HC2SCLK
1 – 2 ns
External clock input high level pulse width
t
EXTHIGH
4 – – ns
Reset assert time after clock stabilization
t
RESW
4 – –
XTIpll or
EXTCLK
PLL Lock Time
t
PLL
300 – µS
Sleep mode return oscillation setting time
t
OSC2
– – 65536
XTIpll or
EXTCLK
Interval before CPU runs after nRESET is released
t
RST2RUN
– 7 –
XTIpll or
EXTCLK